xref: /openbmc/linux/drivers/mmc/host/of_mmc_spi.c (revision 95db3b25)
1 /*
2  * OpenFirmware bindings for the MMC-over-SPI driver
3  *
4  * Copyright (c) MontaVista Software, Inc. 2008.
5  *
6  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
7  *
8  * This program is free software; you can redistribute  it and/or modify it
9  * under  the terms of  the GNU General  Public License as published by the
10  * Free Software Foundation;  either version 2 of the  License, or (at your
11  * option) any later version.
12  */
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/slab.h>
18 #include <linux/irq.h>
19 #include <linux/gpio.h>
20 #include <linux/of.h>
21 #include <linux/of_gpio.h>
22 #include <linux/of_irq.h>
23 #include <linux/spi/spi.h>
24 #include <linux/spi/mmc_spi.h>
25 #include <linux/mmc/core.h>
26 #include <linux/mmc/host.h>
27 
28 /* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
29 #ifndef NO_IRQ
30 #define NO_IRQ 0
31 #endif
32 
33 MODULE_LICENSE("GPL");
34 
35 enum {
36 	CD_GPIO = 0,
37 	WP_GPIO,
38 	NUM_GPIOS,
39 };
40 
41 struct of_mmc_spi {
42 	int gpios[NUM_GPIOS];
43 	bool alow_gpios[NUM_GPIOS];
44 	int detect_irq;
45 	struct mmc_spi_platform_data pdata;
46 };
47 
48 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
49 {
50 	return container_of(dev->platform_data, struct of_mmc_spi, pdata);
51 }
52 
53 static int of_mmc_spi_init(struct device *dev,
54 			   irqreturn_t (*irqhandler)(int, void *), void *mmc)
55 {
56 	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
57 
58 	return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
59 					IRQF_ONESHOT, dev_name(dev), mmc);
60 }
61 
62 static void of_mmc_spi_exit(struct device *dev, void *mmc)
63 {
64 	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
65 
66 	free_irq(oms->detect_irq, mmc);
67 }
68 
69 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
70 {
71 	struct device *dev = &spi->dev;
72 	struct device_node *np = dev->of_node;
73 	struct of_mmc_spi *oms;
74 	const u32 *voltage_ranges;
75 	int num_ranges;
76 	int i;
77 
78 	if (dev->platform_data || !np)
79 		return dev->platform_data;
80 
81 	oms = kzalloc(sizeof(*oms), GFP_KERNEL);
82 	if (!oms)
83 		return NULL;
84 
85 	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
86 	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
87 	if (!voltage_ranges || !num_ranges) {
88 		dev_err(dev, "OF: voltage-ranges unspecified\n");
89 		goto err_ocr;
90 	}
91 
92 	for (i = 0; i < num_ranges; i++) {
93 		const int j = i * 2;
94 		u32 mask;
95 
96 		mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
97 					       be32_to_cpu(voltage_ranges[j + 1]));
98 		if (!mask) {
99 			dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
100 			goto err_ocr;
101 		}
102 		oms->pdata.ocr_mask |= mask;
103 	}
104 
105 	for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
106 		enum of_gpio_flags gpio_flags;
107 
108 		oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
109 		if (!gpio_is_valid(oms->gpios[i]))
110 			continue;
111 
112 		if (gpio_flags & OF_GPIO_ACTIVE_LOW)
113 			oms->alow_gpios[i] = true;
114 	}
115 
116 	if (gpio_is_valid(oms->gpios[CD_GPIO])) {
117 		oms->pdata.cd_gpio = oms->gpios[CD_GPIO];
118 		oms->pdata.flags |= MMC_SPI_USE_CD_GPIO;
119 		if (!oms->alow_gpios[CD_GPIO])
120 			oms->pdata.caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
121 	}
122 	if (gpio_is_valid(oms->gpios[WP_GPIO])) {
123 		oms->pdata.ro_gpio = oms->gpios[WP_GPIO];
124 		oms->pdata.flags |= MMC_SPI_USE_RO_GPIO;
125 		if (!oms->alow_gpios[WP_GPIO])
126 			oms->pdata.caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
127 	}
128 
129 	oms->detect_irq = irq_of_parse_and_map(np, 0);
130 	if (oms->detect_irq != 0) {
131 		oms->pdata.init = of_mmc_spi_init;
132 		oms->pdata.exit = of_mmc_spi_exit;
133 	} else {
134 		oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
135 	}
136 
137 	dev->platform_data = &oms->pdata;
138 	return dev->platform_data;
139 err_ocr:
140 	kfree(oms);
141 	return NULL;
142 }
143 EXPORT_SYMBOL(mmc_spi_get_pdata);
144 
145 void mmc_spi_put_pdata(struct spi_device *spi)
146 {
147 	struct device *dev = &spi->dev;
148 	struct device_node *np = dev->of_node;
149 	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
150 
151 	if (!dev->platform_data || !np)
152 		return;
153 
154 	kfree(oms);
155 	dev->platform_data = NULL;
156 }
157 EXPORT_SYMBOL(mmc_spi_put_pdata);
158